Boring machine



I. H. HAMLIN.-

BORlN-G MACHINE. APPLICATION man MAR. I6, 1921.

1,434,891, Patented Nov. 7, 1922.

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A TTOR/VEVS Patented Nov. 7, 1922,

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Parent JosEPn H. HAMLIN, or wrnsron-sernnr, norm CAROLINA.

BORING MACHINE.

Application filed March 16, 1921. Serial No. 452,842.

To cZZ whom it may concern:

Be it known that I Josnrrr H..HAMLIN, a citizen of the United States, and a resident of Winston-Salem, in the county of Forsyth, in the State of North Carolina,' have invented certain new and useful Im-' provements in Boring Machines, of which the following 1s a specification.

This invention is a boring tool especially adapted for boring the bearing faces of connecting rods and other bearings.

Briefly stated, an important object of this invention is to providea boring tool for bearings having attaching means which properly position the cutting devices so that as the cutting devices are passed through the work, the same will provide the inner face of the bearing with a smooth and round surface.

A further and equally .important object of the invention is toprovide a boring tool for sectional bearings having attaching arms which are adaptedto be confined between the sections of the bearings for temporarily taking the place of the shims which are ordinarily employed so that the liner ting the bearings of the same without the necessity of elaborately dismantling the en gine.

A further object of the invention is to provide a devicerofit-he class described which is efficient in use. of highly simplified construction and cheap to manufacture.

Other objects and advantages-of the invention will be apparent during the course of the following description.

In the accompanying, drawings,-,forming a part of this application and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a side elevation 'of the improved tool.

Figure 2 is a plan view of the same, the handle being removed.

. Figure 3 is a vertical transverse sectional view taken on line 33 of Figure 1.

Figure i is an end elevation of the improved boring tool applied to a connecting rod for the purpose of boring the lining of the same.

Figure 5 is'a fragmentary perspective of a screw embodied in the invention.

Figure 6 is a detailed sectional view through the cutter head. i I I Figure 7 is a sectional view through the cutter head taken at right angles to Figure 6. In the drawing, wherein for the purpose of illustration is shown a preferred embodiment of the invention, the numeral 10 designates a cross head which is provided with an elongated interiorly screw threaded boss 11 through which is threaded a feed screw 12. It will be noted that the sleeve 11 is of a substantial length so as to hold the screw As illustrated in Figures 2 and 3 the cross head 10 is provided with a pair of longi-. tudinal slots l1 which extend out through the ends of the head and slidably receive the shanks 12' of a pair of attaching arms 13.

The shanks 12' are slidable within the slots 11 and may be held'in an adjusted position by means of nuts 14 which are threaded onto the shank. Washers 15 are confined between the nuts 14. and the upper face of the head 10.

It might be stated that a tool constructed in accordance with this invention is preferably made from tool steel highly finished so that theparts are capable of accurate. adjustment. It will be noted with reference to Figure 3 that the rear portion of each arm is provided with a pair of laterally projecting shoulders 16 which flatly contact with the under side of the cross head so as to prevent tilting of the arms 13 with relation to the head 10. f I

The arms 13 form an attaching means for the device and are adapted to be received between ears 1'7 Ora sectional bearingdesignated by the numeral 18. In Figure 4: I have, illustrated the hearing 18 as a part of a 0011 v necting rod 19 of an internal combustion enginethough it is obvious that the bearing. operated on may be the main bearing of an internal combustion engine or any other macircular bearing.

chine. The forward portion of the arms 13 are extended inwardly to form what might be termed hooks which engage about the shanks of bolts 21 employed for connecting the ears 17. The inner sides of the hooked terminal portions 20 are formed with recesses or notches 22 which receive portions of the bolt shanks and thereby hold the device firmly in position. It isunderstood of course that the nuts 24 on the bolts 21 are tightened so as to firmly engage the ears 17 with. the inwardly directed terminal portions 20 of the arms 13. By firmly securing the termi nal portions 20 ofthe arms between the cars 17, the device is accurately arranged in its operative position and when the cutting mechanism is engaged with the Babbitt liners or the anti-friction element 25, a true cut will be made. 1

As is customary, shims are ordinarily arranged between the cars 17 to space the same and as the anti-friction elements 25 which are of semi-circular formation wear, certain of the shims are removed so as to compensate for the wear. In other words the wear in the bearings is compensated for by removing certain of the shims. Therefore it is desirable to provide for these shims when drilling the bearings. As illustrated in Figure i, the terminal portions 20 take the place of the shims and thereby cause the semi-circular anti-friction elements 25 to assume their final position with relation to each other when being drilled or faced. It is thus apparent that the arm 13 not only serves as a means to secure the device in position but also to form a means to properly space the sections ofthe bearings and to take the place of the shims'which are ordinarily used to space the sections of the bearing. By reason of this construction the liners 25 of the bearing are out perfectly true. 7 r

The forward portion of the feed screw 12 is provided with a cutter head which includes stationary and removable disks and 31 respectively. The removable disk 31 is held in position by a nut 32 which is threaded on the shank 33 formed on the forward end of the screw in advance of the .sta-

tionary head 30. A pair of spaced parallel tions beveled and sharpened as indicated at 35 so as to cut the inner side of the semi- In adjusting the cutters to move in a circular path, the beveled ends of the same may be positioned between the opposed spaced parallel straight edgesl36 of the terminal portions of the arms so that the zone of action of the cutters may be properly adjusted. A rule or other measuremay h e employed for ascertaining the correct distance between the straight edges 36. Should it be desired to cut abearing exactly two inches in diameter, the arms 18 are adjusted so that there will be a space of exactly two inches between the same and the cutter head is subsequently advanced and the cutters 3 1 ad justed so that they will contact with the straight edges 36 the same time. At this time, the arms 13 function as a gauge.

lVit-h reference to the foregoing description taken in connection w .h the accompanying drawings, it will be apparent when the device is applied the same is fi mly held in position by the ears 17 so that as the cut- A handle %0 is detachah nnected to the rear portion of the feed screw and may be manually rotated impartin a corresponding movement to the feed screw. The rear end ofthe feed screw is provided with a squared attaching portion d1 which passes through a longitudinal slot in the handle 40. .A thumb screw 41 is threaded onto the rear end of the feed screw so as to hold the handle inan adjusted position on the feed screw.

It is to be understood that the form of the invention herewith shown and described should be taken as a preferred example of the same and that such minor changes in arrangement and construction of parts may be made as are within the spirit of the invention and the scope of what isclaim ed.

Having thus described my invention. what I claim is:

1. A boring; machine for sectional bearings comprising a pair of combined attaching and spacing arms having their terminal por tions hooked for engagement with the connecting means of the sections of a bearing, and a cutter carried by and positioned by said arms. 7

2; A boring machine for sectional bear ings comprising attaching arms adapted to be arranged between the sections of a hearing whereby to space the sections, and'a cutter associated with and positioned by said arms. i I

3. A boring machine for sectional bearings comprising a pairof attaching arms adapted to be arranged between the sections of a bearing to space the same, acutter positioned by said arms, and a feeding. device for the cutter. I

a, A boring machine for sectional bearings comprising a pair of attaching arms adapted to be arranged between the sections of a bearing'to space the same, a cutter associated with said arms, a feeding device for the cutter, and means connecting the feeding device and said arms.

5. A boring machine for sectional bearings comprising a head, attaching arms carried by said head and adapted to be confined between the sections of a bearing for positioning the machine and for spacing the sections of a bearing, and a cutter arranged between said arms.

(5. A boring machine for sectional bearings comprising attaching arms adapted to be arranged between the sections of a bearing whereby to space the sections, and a cut ter associated with and positioned by said arms, portions of said arms having their opposed edges parallel to constitute a gauge for said cutter.

7. A device of the class described com prising a head, attaching and spacing arms adjustably carried by the head and having straight edges constituting a cutter gauge, and a cutter arranged between and positioned by said arms and movable with relation to the same.

8. A boring machine for sectional bearings comprising a head, attaching arms car ried by the head and adapted to be arranged between the sections of a bearing whereby to space the same, a cutter arranged between said arms and movable with relation to the same, and a feed screw connected to said head and supporting said cutter.

9. A boring machine for sectional bearings comprising a head. attaching arms carried by said head and adapted to be arranged between the sections of a bearing, a boss formed on said head, a feed screw threaded through said boss, and cutters connected to the forward end of said feed screw, said arms also forming a means to space the sections of a bearing during the cutting operation.

10. A. boring machine for sectional bear-- ings comprising a head, attaching arms adjustably carried by said head and adapted to be arranged between the sections of a bearing whereby to space the sections, a boss formed on said head, a feed screw threaded through said boss, a cutting device connected to the forward end of said teed screw, and laterally projecting shoulders formed on said arms and contacting with the under side of said head.

JOSEPH H. HAMLIN 

